<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .parents {
            width: 340px;
            height: 220px;
            background-color: palevioletred;
            display: flex;
            box-sizing: border-box;
            gap: 0px 20px;
            justify-content: center;
            align-items: center;
        }

        .child {
            width: 100px;
            height: 200px;
            background-color: pink;
        }
    </style>

</head>

<body>
    <div class="parents">
        <div class="child"></div>
        <div class="child"></div>
        <div class="child"></div>
    </div>
</body>

</html>